Fiber optic microdisplacement and vibration sensor

Amar K. Ganguly; Ardhendu Saha

doi:10.1117/12.339082

3 February 1999 Fiber optic microdisplacement and vibration sensor

Amar K. Ganguly, Ardhendu Saha

Proceedings Volume 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII; (1999) https://doi.org/10.1117/12.339082
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

Fiber-optic displacement and vibration sensor are described in a single set up with higher dynamic range. Hard polymer clad silica fiber is used for both transmission and reception of light. The sensor system consists of coherent optical source, transmitting fiber, bi-convex lens, receiving fiber array, detectors and electronic circuitry. Light of (lambda) equals 980 nm is launched to transmitting fiber and light reflected from the target is received by fiber array and detected by p-i-n diode. Detected power of two adjacent fibers is subtracted by difference amplifier and followed by a level shifter. A mathematical model relating focal length of lens, radius of fiber, spacing between transmitting and receiving fiber, distance of the fiber from optical axis has been developed. The range of linear displacement, and angular displacement using four receiving fiber array is 0 to 1365 micrometers and 0 degrees to 0.5, respectively. The same concept of measurement is also applied to develop a vibration sensor. The range of measurement of peak to peak amplitude of vibration using three fiber array is obtained as 910 micrometers .

Citation Download Citation

Amar K. Ganguly and Ardhendu Saha "Fiber optic microdisplacement and vibration sensor", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); https://doi.org/10.1117/12.339082

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